A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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P waves are pressure waves that travel faster than other waves through the earth to arrive at seismograph stations firstly, hence the name Primary. These waves can travel through any type of material, including fluids, and can travel at nearly twice the speed of S waves.